docs: a subdirectory singleton needs no qmldir, drop it from the plan

The plan claimed a pragma Singleton outside the config root is invisible
until a qmldir names it, and had Task 1 create one plus Tasks 6, 7 and 8
append a line each. That premise was wrong.

Tested: a pragma Singleton in modules/sub/, reached by a plain
import "modules/sub", resolves with no qmldir anywhere. The control was a
reference to a genuinely undefined type, which warns "ReferenceError:
<name> is not defined"; the singleton case produced no such warning and
the binding evaluated. This matches what AGENTS.md already documented
about Theme.qml, which the code review pointed out.

Four registration steps removed and the remaining steps renumbered. The
AGENTS.md note Task 9 adds now records the tested behaviour rather than
the invented one.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01We9zcHEH8ZWHPcQwMaJRNv

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